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> (1)阅读理解先观察和计算,并用“>”、“<”、“≥”、“≤”、“=”填空:4+92,4+42,2+32。请猜想:当则。如∵展开∴6+5。请你给出猜想的一个相仿的说明过程。(2)知识应用①如图⊙O中,
(1)阅读理解先观察和计算,并用“>”、“<”、“≥”、“≤”、“=”填空:4+92,4+42,2+32。请猜想:当则。如∵展开∴6+5。请你给出猜想的一个相仿的说明过程。(2)知识应用①如图⊙O中,
题目简介
(1)阅读理解先观察和计算,并用“>”、“<”、“≥”、“≤”、“=”填空:4+92,4+42,2+32。请猜想:当则。如∵展开∴6+5。请你给出猜想的一个相仿的说明过程。(2)知识应用①如图⊙O中,
题目详情
(1)阅读理解
先观察和计算,并用“>”、“<”、“≥”、“≤”、“=”填空:4+9
2
,
4+4
2
,2+3
2
。请猜想:当
则
。
如∵
展开
∴6+5
。
请你给出猜想的一个相仿的说明过程。
(2)知识应用
①如图⊙O中,⊙O的半径为5,点P为⊙O内一个定点,OP=2,过点P作两条互相垂直的弦,即AC⊥BD, 作ON⊥BD,OM⊥AC,垂足为M、N,求
的值。
②在上述基础上,连接AB、BC、CD、DA,利用①中的结论,探求四边形ABCD面积的最大值。
题型:解答题
难度:中档
来源:不详
答案
解(1)>,=,>,≥
(4分) (
)2≥0化简得a+b≥2
(5分)
(2) 连接MN,OM⊥BD,ON⊥AC, AC⊥BD,所以四边形MPNO是矩形,所以OP=MN,所以
=
(7分)
(3)连接OC,
同理
S=
(10分)
(1)利用二次根式求解,(2)利用勾股定理和三角形的面积求解,
上一篇 :
为任何实数,则的最小值是______
下一篇 :
下列计算正确的是()A.2+3=5B.33-3=
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题目简介
(1)阅读理解先观察和计算,并用“>”、“<”、“≥”、“≤”、“=”填空:4+92,4+42,2+32。请猜想:当则。如∵展开∴6+5。请你给出猜想的一个相仿的说明过程。(2)知识应用①如图⊙O中,
题目详情
先观察和计算,并用“>”、“<”、“≥”、“≤”、“=”填空:4+9 2
4+4 2
如∵
请你给出猜想的一个相仿的说明过程。
(2)知识应用
①如图⊙O中,⊙O的半径为5,点P为⊙O内一个定点,OP=2,过点P作两条互相垂直的弦,即AC⊥BD, 作ON⊥BD,OM⊥AC,垂足为M、N,求
②在上述基础上,连接AB、BC、CD、DA,利用①中的结论,探求四边形ABCD面积的最大值。
答案
(2) 连接MN,OM⊥BD,ON⊥AC, AC⊥BD,所以四边形MPNO是矩形,所以OP=MN,所以
(3)连接OC,
S=